Revert of Remove setVoiceSearchSupported part of EmbeddedSearch SearchBox API.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index 51cd76b21ea029194d92021ca983ca0c596b240c..eda3e577d76b224b4d1e2206011e1321879afb14 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -40,6 +40,7 @@
 #import "chrome/browser/ui/cocoa/location_bar/keyword_hint_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/location_icon_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h"
+#import "chrome/browser/ui/cocoa/location_bar/mic_search_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/page_action_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/selected_keyword_decoration.h"
 #import "chrome/browser/ui/cocoa/location_bar/star_decoration.h"
@@ -101,6 +102,7 @@
       translate_decoration_(new TranslateDecoration(command_updater)),
       zoom_decoration_(new ZoomDecoration(this)),
       keyword_hint_decoration_(new KeywordHintDecoration()),
+      mic_search_decoration_(new MicSearchDecoration(command_updater)),
       manage_passwords_decoration_(
           new ManagePasswordsDecoration(command_updater, this)),
       browser_(browser),
@@ -117,6 +119,8 @@
       base::Bind(&LocationBarViewMac::OnEditBookmarksEnabledChanged,
                  base::Unretained(this)));
 
+  browser_->search_model()->AddObserver(this);
+
   ui_zoom::ZoomEventManager::GetForBrowserContext(profile)
       ->AddZoomEventManagerObserver(this);
 
@@ -132,6 +136,7 @@
   // Disconnect from cell in case it outlives us.
   [[field_ cell] clearDecorations];
 
+  browser_->search_model()->RemoveObserver(this);
   ui_zoom::ZoomEventManager::GetForBrowserContext(profile())
       ->RemoveZoomEventManagerObserver(this);
 }
@@ -405,6 +410,7 @@
   }
 
   [cell addRightDecoration:keyword_hint_decoration_.get()];
+  [cell addRightDecoration:mic_search_decoration_.get()];
 
   // By default only the location icon is visible.
   location_icon_decoration_->SetVisible(true);
@@ -517,6 +523,7 @@
   UpdateZoomDecoration(/*default_zoom_changed=*/false);
   RefreshPageActionDecorations();
   RefreshContentSettingsDecorations();
+  UpdateMicSearchDecorationVisibility();
   if (contents)
     omnibox_view_->OnTabChanged(contents);
   else
@@ -575,6 +582,12 @@
   }
 
   return OmniboxViewMac::ImageForResource(IDR_OMNIBOX_SEARCH);
+}
+
+void LocationBarViewMac::ModelChanged(const SearchModel::State& old_state,
+                                      const SearchModel::State& new_state) {
+  if (UpdateMicSearchDecorationVisibility())
+    Layout();
 }
 
 void LocationBarViewMac::PostNotification(NSString* notification) {
@@ -714,3 +727,12 @@
   if (UpdateZoomDecoration(/*default_zoom_changed=*/true))
     OnDecorationsChanged();
 }
+
+bool LocationBarViewMac::UpdateMicSearchDecorationVisibility() {
+  bool is_visible = !GetToolbarModel()->input_in_progress() &&
+                    browser_->search_model()->voice_search_supported();
+  if (mic_search_decoration_->IsVisible() == is_visible)
+    return false;
+  mic_search_decoration_->SetVisible(is_visible);
+  return true;
+}